Here is some additional helpful information about resizing pictures and picture resolution from MyPinkMermaid:

Here is some info that may help end some of the confusion regarding image and file sizes. I work with photos on line and in print all the time, and 150-200 ppi is sufficient info even for printed photographs. One of the most common mistakes made is confusing dpi (dots per inch) and ppi (pixels per inch). Dpi is what we print on paper and has no relation to ppi, which is what we see on our computer monitor. Pixels per inch is what we need to worry about here. The most you need to view online is 96 ppi. 150 ppi gives you more detail than you will ever need to view on these web pages. Where people get confused resizing their photos is the relationship of ppi to image size. The average digital camera these days gives you a file of about 72 ppi (sounds low, doesn't it) but the picture is a whopping 30x40 inches! You can resize it down to about 3x5, but now it is 450 or so ppi! You have to both resize, an! d reduce your ppi to get manageable file sizes. For the sake of easy downloading, whether emailing or including in your posts, try never to exceed 100kb total file size (and even can be a strain on dial up), or preferably 25 to 35 kilobytes (kb). You can also reduce your file size with jpg compression. When you save a copy of a 4x6 inch 300 ppi photo, you get a choice of jpg compression levels (usually) from 1 to 12. 12 will give you a 2 megabyte photo, which is appropriate for printing, but will choke even a DSL line on a bad day! Save at about level 5 if you still want to be able to print it out, and level 3 will give you a file of about 150kb, still potentially too large for the web. 96 ppi will give even smaller, and more desirable files for posting on this and other boards.

PS - Laurie - I think your pictures of Diana are so cute. I personally really wouldn't mind seeing them bigger, LOL. She looks so much like Samantha in your avatar - Just a classic American Girl Photo.